Thanks for your responses reviewing class questions that i dont know how to do.

Question

Thanks for your responses reviewing class questions that i dont know how to do.

1. The striking of a circular membrane exactly at the center will excite

all circular modes

all radial modes

all modes of a cicular membrane

none

2. By striking of a metal bar free at both ends exactly at its center you'll excite

all even modes

all odd modes

all modes

modes 1 and 3

3. If the velocity of traveling waves on a certain string of length L=0.3 m is v=240 m/s, what is the natural frequency of its fundamental mode?

800 Hz

600 Hz

240 Hz

400 Hz

all even modes

all odd modes

all modes

modes 1 and 3

Explanation / Answer

all modes of circular membrane

all modes

for fundamental frequency wavlength (y) = 2*L = 0.6

and frequency = V/wavelength = 400 Hz

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